package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
        String str="好好学习java";
        StringBuilder builder=new StringBuilder(str);
        builder.append("为了活着");
        System.out.println(builder);
        builder.replace(9,16,"为了梦想");
        System.out.println(builder);
        builder.delete(3,7);
        System.out.println(builder);
        builder.insert(0,"在未来");
        System.out.println(builder);
    }


}
